Well, I know I"m late for the party, and since official voting is over I'll take some liberties here:
Best Poster: A tie with Panamerican, Anung un Rama, JVS, Jdragon. Generally best posters IMO are 1) people that focus on what's being said, not who's saying it 2) rely on data over anecdote (in other words, don't take stances overly based on emotion).
Worst Poster: Oh this is tough. So many duds to choose from. Generally the ones that know how to toe the line from getting banned are the worst as they have a bigger shelf life than they should whereas the absolute abominations make the quick exit. But generally the folks I question what planet they're from are the likes of Big Chief Stove, Kln Omega, and Silicavagina or whatever his name is. There are others that tend to be wastes of space, but are more like amateur comedians than horrible posters.
Best TS is Arkain. Based on effort, organization, and seriousness of topic. He's worth a hundred regular posters.
Best thread: 2018 POTWR. I've thoroughly enjoyed both POTWR elections, and this year's was maybe a bit less funny, but nice to see sanity come back. It was also quite interesting in the penultimate round. PCP was really entertaining.
Worst TS: TCK, ReganAnimator etc.
Lib Shill: DickSarp. Conservative Hack: BobGeese or Splendica.
Least Biased: See best posters. Add most of the mods, AlanB, Ghandi, Kafir Kun, etc.
Best quote: Tough one. Don't remember it exactly, but Pwent talking about when he travels and meets foreigners they don't like him because he frustrates them with his superior intelligence and sublime debating skills. (In other words, he's that delusional cliche person that everyone hates to deal with when travelling -- there's always one!).
Best use of media: It's a tie. 1) HomerThompson. It's interesting how some complain about the hotdogs, but I find they're used when the previous post is so ridiculously out to lunch, one doesn't even know where to begin when responding. That being said, the best gimmick was 2) Snakedafunky's fascist presidential run. While very short, it really brought out the luls with his MS Paint pictures. Those were slaying me.